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时间:2019-02-25
《双掺矿物掺合料高性能混凝土的强度与收缩试验研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、2016年第2期(总第316期)混凝土原材料及辅助物料Number2in2016(TotalNo.316)ConcreteMATERIALANDAD~ⅡNICLEdoi:10.3969/j.issn.1002—3550.2016.02.020双掺矿物掺合料高性能混凝土的强度与收缩试验研究赵素梅,贡金鑫(大连理工大学建设工程学部土木工程系,辽宁大连116024)摘要:对双掺粉煤灰和矿渣的高性能混凝土进行了强度和收缩试验,分析了粉煤灰和矿渣双掺比例(1:2、2:3、1:1)及双掺总量(30%、40%、50%)的影响。研究表明,在双掺比例相同的条
2、件下,随着双掺总量的增加,高性能混凝土强度降低,总收缩和干缩降低,自收缩增加;在双掺总量相同的条件下,随着双掺比例的增加,高性能混凝土早期强度降低,后期强度增加、总收缩降低、自收缩减少和干缩增加。在双掺情况下,单独增加粉煤灰或矿渣的掺量,粉煤灰降低早期强度和总收缩的效果更明显,但矿渣引起自收缩增大的幅度大于粉煤灰引起自收缩减小的幅度;相比于粉煤灰,矿渣降低干缩的效果更明显;矿渣增大自收缩的幅度远小于其降低干缩的幅度。通过回归分析得到了双掺高性能混凝土的收缩计算式。关键词:高性能混凝土;强度;总收缩;自收缩;双掺矿物掺合料中图分类号:TU52
3、8.041文献标志码:A文章编号:1002—3550(2016)02—0000—00StudyonstrengthandshrinkageofhighperformanceconcretewithcompoundmineraladmixturesZHA0Sumei,GONGJinxin(DepartmentofCivilEngineering,FacultyofInfrastructureEngineering,DalianUniversityofTechnology,Dalian116024,China)Abstract:Experime
4、ntsweremadeonthestrengthandshrinkagepropertiesofhighperformanceconcretewithflyash(FA)andgroundgranulatedblastfurnaceslag(GGBFS),includingtheeffectoftheratioofFAtoGGBFS(1:2,2:3,1:1)andtheamountofFAandGG—BFS(30%,40%,50%).TheresultsshowthatinthecaseofidenticalratioofFAtoGGBFS
5、,thestrengthoftheconcretedecreaseswiththeincreaseoftheamountofthecompoundmineraladmixtures,whilethetotalshrinkagestrainandthedryingshrinkagestrainreducesandtheautogenousshrinkagestrainincreases.Inthecaseofidenticalamountofthecompoundmineraladmixtures,thestrengthofcon—crete
6、decreasesatearlyageandincreaseslaterwiththeincreaseofratioofFAtOGGBFS,whiletotalshrinkagestrainandautogenousshrinkagestraindecreasesanddryingshrinkagestrainincreases.Forthecompoundmineraladmixtures,thestrengthandtotalshrinkagestrainofconcretedecreaseatearlyagewiththeincrea
7、seofamountofFAorGGBFS.ContrasttoGGBFS.theinfluenceofFAiSgreaterthanGGBFS.GGBFSismoremarkedforincreasingofautogenousshrinkagethanFAfordecreasingautogenousshrinkage.ThedryingshrinkagestrainofconcretedecreasewiththeincreaseofamountofFAorGGBFS.ContrasttoFA,theinfluenceofGGBFSi
8、sgreaterthanFA.GGBFSismoremarkedfordecreasingdryingshrinkagethanGGBFSforincreasingofautog
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